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RL-ARM User's Guide
RL-RTX Overview 
Product Description Product Specification Technical Data Timing Specifications Advantages 
Your First RTX Application 
Theory of Operation Timer Tick Interrupt System Task Manager Task Management Idle Task System Resources Scheduling Options Pre-emptive Scheduling Round-Robin Scheduling Cooperative Multitasking Priority Inversion Stack Management User Timers Interrupt Functions Configuring RTX Kernel Basic RTX Configuration Tasks Stack Size Stack Checking Run in Privileged Mode Hardware Timer Round-Robin Multitasking User Timers FIFO Queue Buffer Error Function Idle Task Advanced RTX Configuration HW Resources Required Configuration Macros Library Files Using RTX Kernel Writing Programs Include Files Defining Tasks Multiple Instances External References Using a Mailbox SWI Functions SVC Functions Debugging System Info Task Info Event Viewer Usage Hints ARM Version Cortex Version Create New RTX Application Function Reference Event Flag Management Routines Mailbox Management Routines Memory Allocation Routines Mutex Management Routines Semaphore Management Routines System Functions Task Management Routines Time Management Routines User Timer Management Routines 
RL-FlashFS 
RL-TCPnet RL-CAN RL-USB Example Programs Library Reference AppendixDefining Tasks
Real-Time or multitasking applications are composed of one or more tasks that perform specific operations. The RTX kernel supports a maximum of 255 tasks.
Tasks are simply C functions that have a void return type, have a void argument list, and are declared using the __task function attribute. For example:
__task void func (void);
where
| func | is the name of the task. |
The following example defines the function task1 as a task. This task increments a counter indefinitely.
__task void task1 (void) {
while (1) {
counter0++;
}
}
Note
- All tasks must be implemented as endless loops. A task must never return.
- The __task function attribute must prefix the task function declaration in RTX kernel version 3.40 and newer.
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